<h4>Tool</h4><table border="0"><tr><td valign="top"><b>Name</b></td><td valign="top">Union</td></tr><tr><td valign="top"><b>ID</b></td><td valign="top">17</td></tr><tr><td valign="top"><b>Author</b></td><td valign="top">O.Conrad (c) 2003-13</td></tr></table><hr><h4>Description</h4>Calculates the geometric union of the overlayed polygon layers, i.e. the intersection plus the symmetrical difference of layers A and B.
Uses the free and open source software library <b>Clipper</b> created by Angus Johnson.
<a target="_blank" href="http://www.angusj.com/delphi/clipper.php">Clipper Homepage</a>
<a target="_blank" href="http://sourceforge.net/projects/polyclipping/">Clipper at SourceForge</a>
<hr><h4>Parameters</h4><table border="1" width="100%" valign="top" cellpadding="5" rules="all"><tr><th>Name</th><th>Type</th><th>Identifier</th><th>Description</th><th>Constraints</th></tr>
<tr><th colspan="5">Input</th></tr><tr><td>Layer A </td><td>Shapes (input)</td><td>A</td><td></td><td></td></tr><tr><td>Layer B </td><td>Shapes (input)</td><td>B</td><td></td><td></td></tr><tr><th colspan="5">Output</th></tr><tr><td>Union</td><td>Shapes (output)</td><td>RESULT</td><td></td><td></td></tr><tr><th colspan="5">Options</th></tr><tr><td>Split Parts</td><td>Boolean</td><td>SPLIT</td><td>Set true if you want multipart polygons to become separate polygons.</td><td>Default: 1</td></tr></table>